Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1980-09-29
1983-07-19
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
148143, 148144, 148150, 148153, C21D 118
Patent
active
043941940
ABSTRACT:
The present invention relates generally to an improved method and apparatus for induction heat treating and restraint quenching structural members of carbon steel, to a uniform martensitic structure, such that distortion of the member due to rapid quenching is controlled to a minimum. More specifically, the member is generally heated by induction in two stages generally to austenitizing temperature in the range of 1450.degree. to 1750.degree. F. Then the member is liquid quenched under restraint to below 1000.degree. F. to minimize distortion and finally tempered under restraint at a temperature in the range of 750.degree. to 1250.degree. F. Such structural members attain minimum physical properties after heat treating in the range of 110,000 psi yield strength and 125,000 psi tensile strength.
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Tom Allen, "Production of High Strength Quenched and Tempered ERW Tubular Products Utilizing Induction . . . ", 13th Mechanical Working & Steel Processing Conf., Jan. 20, 1971, Pitts., Pa.
R. A. Grange, "The Rapid Heat Treatment of Steel", Metallurgical Transactions, vol. 2, Jan. 1971, pp. 65-78.
Metals Handbook, vol. 2, 8th Ed., "Induction and Flame Hardening", pp. 167-202.
Deemer Carroll L.
Satava George L.
Dean R.
Midland Steel Products
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